# GoneBox — Complete Reference > Free disposable email service with REST API and MCP Server for developers and AI agents. Three domains, 20+ languages, auto-delete in 1 hour. No signup, no tracking. Last updated: 2026-05-20 --- ## 1. Positioning GoneBox is a temporary email service built for two audiences: (1) everyday users who need a quick disposable address to avoid spam, and (2) developers and AI agents who need programmatic email creation for testing, automation, and verification flows. Unlike competitors (Temp-Mail.org, Guerrilla Mail, 10MinuteMail), GoneBox offers a REST API and MCP Server, making it the first temp email service designed for AI agent workflows. It also targets Brazilian users specifically through two localized domains with culturally relevant branding. Category: Temporary Email Service + Developer API + MCP Server Founded: 2026 Headquarters: Remote Contact: contact@gonebox.email --- ## 2. How it works 1. Visit gonebox.email (or sumiu.email / nemexiste.email) 2. A random email address is generated instantly — no signup required 3. Use the address anywhere (signups, verifications, newsletters) 4. Incoming emails appear in the browser inbox in real-time 5. After 1 hour, the inbox and all emails are permanently deleted 6. Developers can do all of this via REST API or MCP Server Technical flow: - Cloudflare Email Routing receives emails at all 3 domains - Cloudflare Workers process and store in D1 (edge database) - Next.js 15 frontend polls or uses Server-Sent Events for real-time updates - TTL-based cleanup runs automatically via Cloudflare Cron Triggers --- ## 3. Plans and Pricing ### Free ($0/month) - 10 inboxes per day - 1-hour email TTL (time-to-live) - All 3 domains available - Browser-based inbox - No signup required ### Dev ($15/month) - 100 inboxes per day - REST API access with X-API-Key - Webhook notifications (email received, inbox expired) - Custom usernames (choose your email prefix) - 1-hour TTL - Email forwarding ### Startup ($49/month) - 1,000 inboxes per day - Priority API (higher rate limits) - Team access (up to 5 members) - Custom usernames - Webhook notifications - 1-hour TTL (extendable to 24h) - API usage dashboard ### Enterprise ($199/month) - Unlimited inboxes - Custom TTL (up to 7 days) - Dedicated support + SLA - Custom domain support (bring your own domain) - SSO integration - Webhook notifications - Priority API with dedicated rate limits - Audit logs Payment: Credit card via Stripe. Monthly billing. Cancel anytime — no long-term contracts. --- ## 4. API and Integrations ### REST API - Base URL: https://gonebox.email/api/v1 - Authentication: X-API-Key header (obtained from dashboard) - Endpoints: - POST /inboxes — Create a new inbox (optional: custom username, domain) - GET /inboxes/:id — Get inbox details and emails - GET /inboxes/:id/emails — List emails in inbox - GET /inboxes/:id/emails/:emailId — Read a specific email - DELETE /inboxes/:id — Delete inbox early - Rate limits: Free N/A, Dev 60 req/min, Startup 300 req/min, Enterprise 1000 req/min - Response format: JSON - SDKs: TypeScript (@gonebox/sdk), Python (gonebox-python) ### MCP Server - Package: @gonebox/mcp-server - Compatible with: Claude Desktop, Cursor, Windsurf, Continue, any MCP-compatible client - Tools exposed: - create_inbox — Create temporary inbox - list_emails — List emails in inbox - read_email — Read email content - delete_inbox — Delete inbox - Use case: AI agents can create temp emails, wait for verification codes, read them, and proceed — all within a single conversation ### Webhooks (Dev+ plans) - Events: email.received, inbox.expired, inbox.created - Delivery: HTTP POST to your URL with JSON payload - Retry: 3 attempts with exponential backoff - Signature: HMAC-SHA256 for verification --- ## 5. Features by Plan | Feature | Free | Dev | Startup | Enterprise | |-----------------------------|------|------|---------|------------| | Inboxes per day | 10 | 100 | 1,000 | Unlimited | | All 3 domains | Yes | Yes | Yes | Yes | | Browser inbox | Yes | Yes | Yes | Yes | | REST API | No | Yes | Yes | Yes | | MCP Server | No | Yes | Yes | Yes | | Custom usernames | No | Yes | Yes | Yes | | Webhooks | No | Yes | Yes | Yes | | Email forwarding | No | Yes | Yes | Yes | | Team access | No | No | 5 seats | Unlimited | | Custom TTL | No | No | 24h max | 7 days max | | Custom domain | No | No | No | Yes | | SLA + dedicated support | No | No | No | Yes | | SSO | No | No | No | Yes | | Audit logs | No | No | No | Yes | --- ## 6. AI Agent Features GoneBox is designed to work as a tool for AI agents: - **MCP Server**: Native Model Context Protocol integration. AI assistants like Claude can create inboxes, wait for emails, and read verification codes — all within a conversation. - **REST API**: Any AI agent or automation tool can interact via standard HTTP requests. - **Deterministic responses**: API returns structured JSON, making it easy for LLMs to parse. - **Fast TTL**: 1-hour default means test data doesn't accumulate. - **No CAPTCHA**: API access never requires human verification. Example AI agent workflow: 1. Agent creates inbox via MCP: `create_inbox(domain: "gonebox.email")` 2. Agent uses the email to sign up for a service 3. Agent polls for verification email: `list_emails(inbox_id: "...")` 4. Agent reads the code: `read_email(email_id: "...")` 5. Agent completes verification with the code 6. Inbox auto-deletes after 1 hour --- ## 7. Domains Explained ### gonebox.email - Audience: Global, developers, AI agents - Default language: English - Tone: Professional, developer-focused - Tagline: "Email Infrastructure for Developers & AI Agents" ### sumiu.email - Audience: Brazilian casual users - Default language: Portuguese (pt-BR) - Tone: Fun, casual, viral - Tagline: "Email temporario gratis — sumiu e ninguem viu!" - "Sumiu" means "it vanished" in Brazilian Portuguese ### nemexiste.email - Audience: Brazilian privacy-focused users - Default language: Portuguese (pt-BR) - Tone: Mysterious, ghost-themed - Tagline: "Email fantasma que desaparece" - "Nem Existe" means "doesn't even exist" in Brazilian Portuguese All three domains share the same backend, inbox system, and API. The difference is branding, default language, and cultural positioning. --- ## 8. Use Cases ### For Developers - Testing email flows in CI/CD pipelines - QA testing signup and password reset flows - Automated testing with disposable addresses - Webhook testing and email parsing ### For AI Agents - Automated account creation for testing - Email verification in agent workflows - Reading confirmation codes programmatically - Multi-step automation requiring email interaction ### For Everyday Users - Signing up for services without giving your real email - Downloading free resources that require email - Avoiding newsletter spam - One-time verifications ### For Brazilian Users - Email temporario para cadastros em sites brasileiros - Proteger privacidade em compras online - Evitar spam ao se cadastrar em promos - Teste rapido de servicos sem comprometer email pessoal --- ## 9. Technical Details - **Frontend**: Next.js 15 (App Router, Server Components) - **Backend**: Cloudflare Workers (Hono framework) - **Database**: Cloudflare D1 (SQLite at the edge) - **Email**: Cloudflare Email Routing (all 3 domains) - **CDN/Edge**: Cloudflare (global, <100ms latency) - **Languages**: 20+ via next-intl (en, pt-BR, es, fr, de, it, ja, ko, zh, ar, ru, hi, tr, nl, pl, sv, da, fi, no, th) - **MCP Server**: TypeScript, published to npm - **Auth**: API keys for developers, no auth for free browser usage --- ## 10. FAQ Q: What is a temporary email? A: A temporary email (also called disposable email or throwaway email) is an email address that works for a short time and then self-destructs. You can receive emails but the address expires automatically. GoneBox inboxes last 1 hour. Q: Is GoneBox free? A: Yes. The free plan gives you 10 inboxes per day with no signup required. Paid plans start at $15/month for API access and higher limits. Q: How long do emails last? A: By default, 1 hour. On the Startup plan you can extend to 24 hours, and Enterprise allows up to 7 days. Q: Can I send emails from GoneBox? A: No. GoneBox is receive-only. You can receive emails at your temporary address but cannot send outgoing emails. Q: Is using a temporary email legal? A: Yes. Using a temporary email to protect your privacy is perfectly legal. However, using any email service for fraud, harassment, or illegal activity is prohibited by our terms of service. Q: Do you have an API? A: Yes. The REST API is available on Dev ($15/mo) and higher plans. It supports creating inboxes, listing emails, reading email content, and webhooks. Full docs at https://gonebox.email/api-docs. Q: What is an MCP Server? A: MCP (Model Context Protocol) is an open standard that lets AI assistants like Claude, Cursor, and Windsurf use external tools. GoneBox's MCP Server lets AI agents create and read temporary emails as part of their workflows. Q: Can I choose my own email address? A: Yes, on paid plans (Dev and above). You can pick a custom username like "john@gonebox.email". Free users get randomly generated addresses. Q: Is my data stored? A: Emails are stored only for the inbox TTL (default 1 hour), then permanently deleted. We do not log email content, do not run analytics on messages, and do not sell data. GDPR and LGPD compliant. Q: Which domains can I use? A: All plans include all three domains: gonebox.email (global), sumiu.email (Brazilian casual), and nemexiste.email (Brazilian ghost). Enterprise plans can also add custom domains. --- ## 11. Contact and Links - Website: https://gonebox.email - API Docs: https://gonebox.email/api-docs - Pricing: https://gonebox.email/pricing - Privacy Policy: https://gonebox.email/privacy - Terms of Service: https://gonebox.email/terms - Email: contact@gonebox.email - MCP Server: npm @gonebox/mcp-server